wl1271: Don't generate null func template for ad-hoc

The null func template is not needed for ad-hoc, and it's generation is not
supported for ad-hoc (mac80211 will WARN about it.)

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_cmd.c

@@ -709,18 +709,30 @@ out:
 
 int wl1271_cmd_build_null_data(struct wl1271 *wl)
 {
-	struct sk_buff *skb;
-	int ret = 0;
+	struct sk_buff *skb = NULL;
+	int size;
+	void *ptr;
+	int ret = -ENOMEM;
 
-	skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
-	if (!skb)
-		goto out;
 
-	ret = wl1271_cmd_template_set(wl, CMD_TEMPL_NULL_DATA, skb->data,
-				      skb->len);
+	if (wl->bss_type == BSS_TYPE_IBSS) {
+		size = sizeof(struct wl12xx_null_data_template);
+		ptr = NULL;
+	} else {
+		skb = ieee80211_nullfunc_get(wl->hw, wl->vif);
+		if (!skb)
+			goto out;
+		size = skb->len;
+		ptr = skb->data;
+	}
+
+	ret = wl1271_cmd_template_set(wl, CMD_TEMPL_NULL_DATA, ptr, size);
 
 out:
 	dev_kfree_skb(skb);
+	if (ret)
+		wl1271_warning("cmd buld null data failed %d", ret);
+
 	return ret;
 
 }

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -1619,12 +1619,10 @@ static void wl1271_op_bss_info_changed(struct ieee80211_hw *hw,
 	     */
 	    memcmp(wl->bssid, bss_conf->bssid, ETH_ALEN)) {
 			memcpy(wl->bssid, bss_conf->bssid, ETH_ALEN);
+
 			ret = wl1271_cmd_build_null_data(wl);
-			if (ret < 0) {
-				wl1271_warning("cmd buld null data failed %d",
-					       ret);
+			if (ret < 0)
 				goto out_sleep;
-			}
 
 			/* filter out all packets not from this BSSID */
 			wl1271_configure_filters(wl, 0);